AIEEE 2002

Aluminium is extracted by the electrolysis of

The metal extracted by leaching with a cyanide is

Oxidation number of Cl in CaOCl2 (bleaching powder) is :

In case of nitrogen, NCl3 is possible but not NCl5 while in case of phosphorous, PCl3 as well as
PCl5 are possible. It is due to :

In XeF2, XeF4, XeF6 the number of lone pairs of Xe are respectively :

When H2S is passed through Hg2S we get :

Number of sigma bonds in P4O10 is :

\(C{e^{ + 3}},\,\,L{a^{ + 3}},\,\,P{m^{ + 3}}\,\,\) and \(Y{b^{ + 3}}\,\,\) have ionic radial in the increasing order as

The correct order of ionic radius is

Polymer formation from monomers starts by

Which of the following is a redox reaction ?

A metal M readily forms its sulphate MSO4, which is water-soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hydroxide M(OH)2 which is soluble in NaOH solution. The M is :

KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it :

The metallic sodium disolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to formation of :

Na and Mg crystallize in BCC and FCC type crystals respectively, then the number of atoms of
Na and Mg present in the unit cell of their respective crystal is :

Freezing point of an aqueous solution is (-0.186)oC. Elevation of boiling point of the same solution is Kb = 0.512 oC, Kf = 1.86 oC, find the increase in boiling point.

In a mixture of A and B, components show negative deviation when :

With increase of temperature, which of these changes?

In a compound C, H and N atoms are present in 9 : 1 : 3.5 by weight . Molecular weight of the compound is 108 g mol-1 . Molecular formula of compound is

Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol-1) is

Uncertainty in position of a minute particle of mass 25 g in space is 10-5 m. What is the uncertainty in its velocity (in ms-1) (h = 6.6 \(\times\) 10-34 Js)

In a hydrogen atom, if energy of an electron in ground state is -13.6 eV, then that in the 2nd excited state is

The formation of gas at the surface of tungsten due to adsorption is the reaction of order :

Alum helps in purifying water by :

For the reactions
2C + O2 \(\to\) 2CO2; \(\Delta H\) = -393 J
2Zn + O2 \(\to\) 2ZnO; \(\Delta H\) = -412 J

A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is J (Q1 + Q2). This data :

The heat required to raise the temperature of body by 1 K is called :

If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :